
public class Main {
	public static void main(String[] args){
		int x = 3;
		while (x > 0) {
			if (x > 2) {
				System.out.print("a");
				}
			
			if (x == 2) {
				System.out.print("b c");
				}
			
			x = x - 1;
			System.out.print("-");
			
			if (x == 1) {
				System.out.print("d");
				--x;
			}
		}
	}
}
